Well I'm not sure if this will help you but how i found mine was that he just came to me. Sometimes they just arrive on their own and eventually you will find them. Either that or try telepathically talking to any demons/spirits that are present. Ouija boards are also a very good way to come in contact with demons. ^^ Hope this helped a bit if not sorry ^^'
i dont know if he has already but the first Demon i came across was Asmoday..... He told me he was but soon after that contact was scarce plus i didnt fell any bioelectricity......idk